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Calculated dose distributions at the position of the planning isocenter for (A–B) patient No. 3 and (C-D) patient No. 5. (A) A volumetric-modulated arc therapy based stereotactic body radiation therapy (SBRT) plan. (B) A 2-field intensity-modulated proton therapy (IMPT) plan. (C) A static-field SBRT plan. (D) A 2-field IMPT plan.
